maxon motor
18
maxon motor control
1-Q-EC Amplifier DEC Module 24/2
Operating Instructions
April 2015 Edition / document number 1002422_PDF_E - 04 / subject to change
10.2.3 Motor phase
The DEC Module 24/2 has no built-in choke per phase.
For the most motors and applications no additional motor chokes are neces-
sary. In case of high power supply vV
CC
and a motor with very low
inductance the current ripple will become too high, additional chokes on the
motherboard are needed. The minimum inductance of each choke can be
calculated with the formula below.
¸¸
¹
·
¨¨
©
§
t
Motor
N
PWM
CC
Phase
L
I
f
V
L
3
.
0
6
2
1
L
Phase
[H]
External inductance per phase
V
CC
[V]
Power supply vV
CC
f
PWM
[Hz]
PWM frequency = 46 800 Hz
I
N
[A]
Nominal motor current (correspond to line 6 in maxon
catalogue)
L
Motor
[H]
Terminal inductance phase to phase of the motor
If the result of the calculation is negative, no additional chokes are necessary.
Nevertheless, the use of chokes in combination with additional filter compon-
ents can be useful to reduce the emission of electromagnetic interference.
An additional choke must feature electromagnetic shielding, a high saturation
current, minimal losses, and a nominal current greater than the continuous
current of the motor. The below wiring example refers to an additional in-
ductance of 22 μH. If a different additional inductance is required, also the
filter components must be adapted accordingly.
Should you need further help with the filter design, contact maxon Support at
http://support.maxonmotor.com
.
L1
22uH
J2/3
1
Motor winding 1
5
GND
Motor winding 1
560R
150p
68p
DEC Module 24/2
Motherboard (customer-specific)
Motor
Wiring of Motor Winding 1 (analogously valid also for Motor Windings 2 & 3)
Recommendation for the motor choke:
–
Coiltronics DR1040-220-R
L
N
= 22
μ
H, R
DC
= 54 m
Ω
, I
DC
= 2.5 A, I
sat
= 2.9 A, shielded
–
Bourns SRU1038-220Y
L
N
= 22
μ
H, R
DC
= 54 m
Ω
, I
DC
= 2.2 A, I
sat
= 2.3 A, shielded
–
Würth Elektronik WE-TPC-XLH 744066220
L
N
= 22
μ
H, R
DC
= 60 m
Ω
, I
DC
= 2.5 A, I
sat
= 2.2 A, shielded
